Calor Fusão Gelo
- Created by
- Renato Passos, Eng. de Software
- Reviewed by
- Renato Passos, Eng. de Software
Last updated: Apr 18, 2026
About this calculator
The Water Fusion Heat Calculator helps determine the energy required to melt a specific amount of ice or the mass of ice melted using a given energy input. The fusion of ice occurs at 0°C, and water's latent heat of fusion is 334 kJ/kg. This means 334 kilojoules are needed to convert 1 kilogram of ice into liquid water without changing the temperature.
It uses the formula Q = m × L, where Q is energy (in kJ), m is mass (in kg), and L is the latent heat of fusion (334 kJ/kg). Enter two values to calculate the third. For example, to melt 5 kg of ice, the calculator multiplies 5 × 334, resulting in 1,670 kJ required.
This tool is useful in thermochemistry studies, thermal engineering, or practical scenarios like estimating energy consumption to melt ice in refrigeration systems. Ensure values are input in the correct units (kJ and kg) and that the initial ice temperature is 0°C, as the latent heat applies only to phase changes.
Common considerations include not confusing fusion heat with specific heat or vaporization. Additionally, if ice is below 0°C, part of the applied energy will first heat the ice to 0°C before melting, requiring additional calculations beyond this tool's scope.
Frequently asked questions
What is the latent heat of fusion for water?
The latent heat of fusion for water is 334 kJ/kg. This represents the energy required to convert 1 kilogram of ice into liquid water at 0°C without changing the temperature.
How does the ice melting calculator work?
The calculator uses the formula Q = m × L, where Q is energy, m is the ice mass, and L is the latent heat (334 kJ/kg). Input two values to compute the third.
In which scenarios is this calculator useful?
It is useful for thermochemistry problems, thermal efficiency calculations, or estimating energy needs for industrial ice-melting processes.
Do I need to convert units before using the calculator?
Yes, ensure mass is in kilograms and energy in kilojoules. Values in other units, such as grams or joules, must be converted first.
What happens if the ice is below 0°C?
If the ice is below 0°C, part of the energy provided will first heat it to 0°C before melting. This additional calculation is not directly handled by this tool.